Duplex interlocked hydraulic broaching machine



April 30, 1940; K. c. MONROE DUPLEX INTERLOCKED HYDRAULIC BROACHINGMACHINE 4 Sheets-Sheet 1 Filed March 28, 1938 L I I April 30, 1940. K.c. MONROE DUPLEX INTERLOCKED HYDRAULIC BROACHING MACHINE 4 Sheets-Sheet2 Filed March 7 28, 1938 April 30, 1940. K. c. MONROE DUPLEX INTERLOCKEDHYDRAULIC BROACHING MACHINE Filed March 28, 1938 4 Sheets$het 3 Z mm n v1 J 2 W J l 8 IQ H M .ai M f m 5 z a 7 n u Fit! "w" Q n m m 2 n m n z nn n u u H Q m i 3 m a a 3 u I. J n n H m m n g .T u u L mm 0 w L m 5 m.7 M Z w H .H T l LET L .mwg

April 30, 1940. K. c. MONROE,

DUPLEX INTERLOCKED HYDRAULIC BROACHING MACBINE Filed March 28. 1958 4Sheets-Sheet 4 &

Patented Apr. 30, 1940 UNITED STATES DUPLEX INTER/LOCKED HYDRAULICBROACHING MACHINE Kenneth C. ,Monroe, Hudson,

The Lapointe Machine Tool Company, Mass., a corporation of MaineApplication March 28,

2 Claims.

This invention relates to a duplex hydraulic breaching machineparticularly designed for surface breaching operations, and furtherrelates to certain hydraulic control devices and electric interlockstherefor.

It is the general object of my present invention to provide a duplexhydraulic breaching machine so controlled and interlocked that a harmfulsequence of operations cannot be produced.

More specifically, I provide a duplex breaching machine in which thework supports cannot be moved while the work is clamped thereon, and inwhich a return stroke of a breach cannot be made until the associatedwork support is shifted to displace the work piece from breachingposition.

I also positively prevent a working stroke of either breaching ramunless the associated work support is in operative position and unlessthe work thereon is duly clamped. If the work is mounted on a turn-tableon the work support, the table must also be in one of its predeterminedangular positions before the breaching ram can be started.

I further provide a single hand-operated switch so connected thatsuccessive separate closings of said switch will effect successiveprearranged operations of the breaching machine and its associated partsin a definite order. Other features of the machine and of theinterlocked sequence of operations will be hereinafter described indetail.

My invention further relates to arrangements and combinations of partswhich will be hereinafter described and more particularly pointed out inthe appended claims.

A preferred form of my invention. is shown in the drawings, in whichFig. 1 is a diagrammatic representation of my improved duplex breachingmachine, with its hydraulic control and-electric interlock;

Figs. 2 and 3 are similar views but show different operative conditions;

Fig. 4 is a front elevation of the work supports,

work-clamping devices, and associated parts;

Fig. 5 is a side elevation of the parts shown in Fig. 4; and

Fig. 5 is a detail view to be described.

Referring to Fig. 1, I have indicated diagrammatically a duplexhydraulic breaching machine having slides A and B to which surfacebreaches or other tools may be secured. The slide A is operated by a ramR comprising a cylinder Ill and piston II connected by a piston rod,|2to II the slide A. Aram R is similarly provided for Mass, assignor toHudson, v

1938, Serial No. 198,513

the slide B and comprises a cylinder l5, piston l6 and piston-rod H.

The cylinders l0 and a pipe I9 and are connected by pressure supplypipes 20 and 2| to a variable discharge reversible pump P which may beof the general type shown in West Patent, No. 1,722,832.

Suitable provision is made for reversing and controlling the dischargeof the pump P, which provision includes a pinion 22 and rack bar 23which is connected to a pump control lever 24. The lever 24 is pivotedat 25 and is provided with a handle 26 for manual operation.

The lever 24 is connected by a link 21 to a lever 28, which in turn isconnected to a knockofi rod 30 having a collar 3| adiustably securedthereon and positioned for engagement by an arm 32 on the slide A as theslide completes its working stroke. The lever 24 is also connected by alink 34 and lever 35 to a second knock-off "rod 36 having an adjustablecollar 31 positioned for engagement by an arm 38 on the slide B.

The pump control lever 24 also has a pin-andslot connection with theupper end of a piston rod 40 connected to a piston 4| in a pump-shiftingcylinder 42. The cylinder 42 is connected by pipes 43 and 44 to acontrol valve V having a connection 45 to an independent supply ofliquid under pressure andhaving an exhaust connection 46.

The valve V may be shifted in either direction by energizing one of thetwo solenoid coils which are mounted in the two ends of the valve V.Each of these coils is effective to shift the valve in a defineddirection. When the coil circuit is broken, the valve returns at once toneutral or mid position, with both ends of the cylinder 42 connected toa sump, not shown.

' My improved breaching machine is also provided with a pair of worksupports C and D (Figs. 4 and 5) which are each slidable forward in themachine to inoperative or leading position and which are slidablerearward to operative or breaching position. The work support C isconnected by a piston rod 50 (Fig. 1) to a piston 5| in a cylinder 52,and the work support D is connected by a piston rod 54 to a piston 55 ina cylinder 56. The cylinder 56 is connected by pipes 51 and 58 to acontrol valve V, and the cylinder 52 is similarly connected to the valveV by crossed pipes 60 and GI.

The connections are such that pressure in the pipe 51 is simultaneouslyapplied through the pipe 6|, and that pressure in the pipe 58 issimultaneously applied through the pipe 50. These reverse connectionsbetween the valve V and cyl- |5 are cross connected by u inders 52 and56 cause the pistons 55 and 55. and the work supports C and D to movesimultaneously in opposite directions.

The valve V has a supply pipe 62 for liquid under constant pressure andan exhaust pipe 63, and is manually shiftable to reverse the connectionsto the cylinders 52 and 56 by a hand lever 55, which lever is, however,normally locked by a plunger (ill in a solenoid coil 67. The valve V canbe shifted only while the plunger 65 is withdrawn, and the valve islocked at all times except when the solenoid coil is energized.

A device ill for clamping the Work on the work support C is actuated bya piston ll in a cylinder 12 (Figs. 4 and 5) mounted on the fixed frameof the machine and connectedby pipes '33 and i l to a valve V having asupply pipe l5 and exhaust pipe 73 and manually operated by a hand leverll. When the valve shifted to admit pressure through the upper pipe 13,the clamping device ill moves downward to engage the work and hold itfirmly on the work support 0. The device ill does not move forward withthe work support.

A device fill for clamping the work on the work support D is similarlyactuated by a piston Si in a fixed cylinder 852 connected by upper andlower pipes 83 and E i to a valve V having a supply pipe 35 and exhaustpipe 86 and movable by a hand lever ill.

A slide switch E is normally open but is closed when engaged by a camplate on the slide A and a similar slide switch F is normally open butis closed when engaged by a cam plate ill on the slide B. A limit switchG is normally open but is closed when engaged by a cam plate $32 on thework support C as the work support reaches its extreme forward orloading position. A similar limit switch H is normally open but isclosed when engaged by a cam plate G3 on the work support D, as the worksupport D reaches forward or loading position.

A pressure-operated double switch K is mounted on the cylinder "52 and asimilar switch L is mounted on the cylinder 82. Each of these switchescontrols two separate circuits and is so constructed that the uppercircuit is closed and the lower c cuit open when pressure is ap pliedthrough one of the pipes M or i l to the lower end of the clampingcylinder E2 or 82, ,thereby unclamping the work.

If pressure is applied through one of the upper pipes 13 or 83 to clampthe work, the double switches K and L are reversed, closing the lowercircuits and opening the upper circuits through these switches.

Under some conditions of operation, the work W on the work support willdesirably be mounted on a turn-table lilo, (Fig. l) so that the work maybe reversed and so that a second surface may be breached before removalof the work from the work support.

In order to insure that the turn-table Hid shall be locked in some oneof its predetermined angular positions before a breaching operation canbe performed, 1' provide special protective devices which will now bedescribed. For purposes of illustration, I have shown the turn-tableHill as provided with a hub portion it! having recesses or sockets Hi2(Figs. 1 and spaced apart 186, it being understood that any number ofsockets in any desired angular. relation maybe substituted.

I also provide a plunger m3 slidable in a bearwire W in the work supportC and extending into one of the sockets lot when normally seated. Theplunger W3 is mounted on a spring plate ltd fixed to the end of the worksupport C and the plate ltd has a cam-shaped handle portion Hi6.

A normally-open protective index switch M is positioned to be engagedand closed by the cam portion lull of the spring plate M25 as the worksupport C reaches rearward or breaching position, provided the springplate is in normal position, with the plunger Hi3 seated and theturntable lt il looked, as shown in Fig.1. If the turntable is notaccurately positioned, the plunger will be held out or normal position,as shown in Fig. 5 and, the cam portion ltd will be later allydisplaced, so that it cannot engage and close the index switch M. Theclosing of the switch M is thus dependent both on correct indexing andlocking of the turn-table we and also on movement of the work support 0to full rearward or breaching position. a g

The work support D may be provided with a similar turn-table llll (Fi s.fl and 5) and with similar locking structure, including a springplate ill (Fig. 1) having a cam portion H2 positioned to engage and closeanormally open protective index switch N when the work support D andturn-table llll are moved rearward to breaching position.

Even if the turn-tables lilo and lill areremoved, the switches M and Ncontinue to insure full rearward movement of the work supports.

If the switch M or no breaching operation can be performed, as will behereinafter explained. I

Current for the electric-interlock is supplied through line wires llldand l2 l, and a hand-operated switch or pushebutton line wire lit. Thewire l Zll is connected to both solenoid coils in the valve V and alsoby a branch M2 to v the upper part of the pressure switch K.

A wire i222 connects terminals in the upper parts of the pressureswitches K and L, and a wire it'd connects the upper part oithe switch Lto the solenoid coil the return circuit. being through a wire lit to theline wire iii.

The right-hand solenoid in the switch Vis connected by a wire i353 tothe limit switch G, and the left-hand solenoid is connected by a wirelSl to the limit switch H. TheswitchG is connected by a wire 32 to theindex switch N, and the switch His index switch M.

A wire E li connects the index switch Mto the lower part of the pressureswitch K and a wire l ii connects the lower part of the pressure switchK to the slide switch which in turn is connected to the line wire lZl.

The index switch N is connected by a wire I50 to the lower part of thepressure switch L, which in turn is connected through a wire l-il to theslide switch F and thencethrough a branch wire connection 552 to theline wire l2 3.

Having described the details ofv construction of my improved breachingmachine and of the hydraulic control and electric interlock therefor, Iwill now describe its operation:

Assuming that the parts are in the position shown in Fig. l, with apiece of work mounted on the work support 0 and moved rearward tobreaching position, the operative procedure will be as follows:

N which corresponds to the work support in broaching position is notclosed,

8 is provided in the connected by a wire .533 to the I The handle" ofthe valve V? will now be moved downwardgadmitting oil underjpressure tothe upper .end of the cylinder I2 and forcingflthe,

member I0v downward to engage and, clamp'the work. This application ofpressure to the upper wire I2Ilthrough the left-hand Solenoid in thevalve V, wire I3I,. limit switch H, wire I33, index switch M, wire M0,pressure switch K, wire I4I,

' and slide switch E back to the line wire I2 I.

*fIhe valve V is therefore automatically shifted to-the left, admitting.oil under pressure above the piston AI and shifting the pump P tosupply.

oil under pressure through-the pipe 20 to the upper end of the cylinderI0, thus causing the slide A to move downward, carrying the broach tooland performing abroaching operation on the Work. I

As soon as thefslide A starts to move downward, the described circuit isbroken by the opening of the slide switch E, whereupon'the valveVautomaticallyv returns to mid or neutral position, with both ends of thepump-shifting cylinder 42 connected to atmosphere. The lever 24 is notshifted, however, and the pump P continues to force the piston IIdownwards in the cylinder I0 7 until the arm 32Zon the slide A engagesthe col,-v

lar 3| and positively returns the lever 24 to mid 'or neutralposition,'- whereupon the machine comes to rest.

'Before the work supports can be shifted, it is now necessary to movethe lever 11 upward to raise the member 10 and unclamp the work. By

so doing, the pressure switch K is returnedto the condition shown inFig. 1.

' The switch Scan then be closed to complete a circuit from the wire I20through thewire I22, upper part of switch K,.wire I23, upper part ofswitch L and. wire I24 to the solenoid coil 61 and through the wire I25back to the line wire I2I.

The coil 61 is thus energized, withdrawing the the hand lever of thevalve V, thus reversing the connections to the cylinders 52 and 56 andcausing the work support C'to advance and the work support D to moverearward to the positions indicated in Fig. 3.

The handle 8'! is then moved downward to shift the valve V toapplypressure to the upper end of the work-clamping cylinder 82, therebyclamping the work and reversing the pressure switch L. This breaks thecircuit of the solenoid coil 61 and prevents any further movement of thework supports so long as the work is clamped by the member 80. y

The switches are then in the positions shown in Fig. 3, and by manuallyclosing the switchS, a circuit can becompleted from the line wire 12!)to the solenoid coil in the right-hand end of the valve V and thencethrough the wire I I30, limit switch G, wire I32, index switch N, wireI50,

lower part of pressure switch L, wire I5I, slide switch F and wire I52to the line wire I2I.

The valve V will thereupon shift automatically to the right, admittingoil under pressure to the lower end of the pump-shifting cylinder 42 andshifting the lever 24 and rack bar 23 to the position shown in Fig. 3.

The pump thereupon supplies oil under pressure through the pipe 2| tothe upper end of the cylinder I5, thereby causing the slide B to movesequence.

downward for a'broaching stroke, upon the com-' pletion of whichthe-pump isreturnedto neutral position by the operation of the knock-offarm 38.

At the end of this breaching operation, the broaching slides A and Bwill be in the initial positions shown in Fig.1, but the work supports Cand D will be inthe reverse positions shown in Fig. 3.

The work on the work support D is then unclamped, thereby reversing thepressure switch L. The work on the Work support C is either rotated toanew predetermined angular position or is removed and replaced by a newpiece of work, after which the switch S is closed to release the lever65 and the lever is shifted to reverse the connections to the cylinders52 and 56,

causing the work supports C and D to return to the position shown inFig. 1, thus completing the cycle of operations. It will be noted thatthe machine is so controlled and interlocked that the lever 65 cannotposition, is accurately indexed, and has the work thereon securelyclamped in.position. It is also necessary that the second work supportbe in its extreme forward or loading position,

and that the broaching slide A or B which is about to become operativebe at the limit of its return travel.

It is also impossible to accomplish a return movement of .a broach untilthe broached piece of work has been unclamped and until the associatedwork support has been moved forward to shift the work out of the path ofthe returning broach.

Attention is also called to the fact that successive closings of asingle manual switch S effect all of the desired automatic operations ofthe machine, provided certain intervening manual operations areperformed in a predetermined If these manual operations are not soperformed, or are performed in the wrong sequence, no harm is done butthe machine simply refuses to operate and remains at rest. Y

Having thus described my invention and the advantages thereof, I do notwish to be limited to the details herein disclosed, otherwise than asset forth in the claims, butwhat I claim is:

1. A duplex hydraulic breaching machine comprising a pair of alternatelyoperative and oppositely moving broaching slides, a separate worksupport for each broaching slide, means to move said worksupportssimultaneously and oppositely to loading and broaching positions,hydraulic devices to clamp the work on a work support only after saidsupport and work have been fully moved to broachingposition, controldevices operatively interlocking said work support and said clampingdevices and automatically preventing movement of said work supports solong as either clamping. device is operative, and said control devicesincluding electric control circuits and switches therefor associatedwith said clamping devices and operated by application of or reversal ofpressure in said clamping devices.

2. A duplex'hydraulic broaching machine comp-rising a pair ofalternately operative and oppositely moving broaching slides, a separatework support for each breaching slide, means to move said work supportssimultaneously and oppositements of the machine must be performed inpredetermined sequence, and sa'id 'controi means ineluding electriccontrol circuits, circuit-changing devices and a singlemanually-operated switch effective by successive closings to cause 'orpermit said successive operations in said predetermined sequence only. 7

KENNETH C. MONROE.

